The head of the nation’s only federally approved marijuana farm has revealed that he is developing cannabis eye drops to treat glaucoma.

In a podcast interview, pharmacologist Mahmoud ElSohly, director of the University of Mississippi’s Marijuana Research Project, told the story of an eye doctor who discovered that cannabis can relieve the interocular pressure associated with glaucoma. But while the THC in the plant treated the symptoms, it also meant patients experienced the high.